In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Isolation of an N-Heterocyclic Carbene Complex of a Borasilene, published in 2019, which mentions a compound: 141556-42-5, Name is 1,3-Bis(2,4,6-trimethylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene, Molecular C21H24N2, Application of 141556-42-5.
Borasilenes, that is complexes which contain a boron-silicon double bond, have scarcely been isolated to date. In pursuit of such species, (Me3Si)3SiB(Cl)NHI (2, NHI=bulky N-heterocyclic imine) was prepared and treated with KOtBu to achieve formal extrusion of ClSiMe3. The formation of an elusive borasilene (3int) is postulated and it was verified by isolation of the N-heterocyclic carbene adduct (Me3Si)2SiB(IMe4)NHI (4, IMe4=1,3,4,5-tetramethyl-imidazolin-2-ylidene). X-ray crystallog. study and theor. calculations on 4 diagnosed a boron-silicon double bond with marked zwitterionic character. The neg. charge resides at the Si atom which marks the apex of a trigonal pyramid. Structural comparison of 4 with boron cation congeners (5+, 6+) suggests that the pos. charge is mainly located at the trigonal planar-coordinated B center. The conversion of 4 with pinacolborane (HBpin, 2 equiv) resulted in cleavage of the double bond to produce (Me3Si)2Si(Bpin)2 and (NHI)BH2(IMe4).
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Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles